Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc253b34db08dc4c…

MALICIOUS

PDF

94.8 KB Created: 2021-10-20 11:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 029f25a4c0fa7771ad4edc82a562a9ed SHA-1: bc901ea66bcebe65def453d2bff27e4812df4c37 SHA-256: fc253b34db08dc4c62a43a56cd6bebdbb90922944aaaa78a0695e603bbe2a9f7
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=trails+of+cold+steel+4+cooking+guide PDF link annotation
    • http://voyagevietnamlaos.com/hinhanh/file/pobojopujavinem.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/91887201319.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d18bacb5e6843b408ebe91494722e7a4/vowilajar.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/nizakum.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33040824632.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/melonokakufiwojabigakes.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/momomuxajonitonugixe.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/70876844005.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/58609160319.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/73304672433.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/68920467745.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/wuzagamezakeboliwizajido.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/92085171905.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/83516233737.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/jarelibek.pdfIn PDF document text
    • http://slovoveri.org/userfiles/xudon.pdfIn macro / runtime command snippet
    • http://sporteambiente.it/ckfinder/userfiles/files/diwenonari.pdfIn macro / runtime command snippet
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/zegegiwobulovewaboxeluja.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9nenlu8se6f0ff84j348od1he2/fapugagadanemesuvisiba.pdfIn PDF document text
    • https://gdaniec.com/upload/files/30029650008.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/37217935252.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/separotojawizo.pdfIn PDF document text
    • http://slesnick.net/useIn macro / runtime command snippet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 19436 bytes
SHA-256: 221d523e792df9fd073b052424056f0e9562e2547fc3ee5eb6743bb634d82a42
font_01_sfnt_off00013c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B4 10884 bytes
SHA-256: 14f227581ab8d383d44807dbf0da751948dd46f07e7ab1f7013e5f9b66120b7e

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